Excessive molten drop observation device for gas metal arc welding under condition of high pressure gas

An excessive molten drop observation device for gas metal arc welding under the condition of high pressure gas is applied to welding experiments and studies. A weldment rotary device and a welding machine are fixed on a welding support, a main shaft support is arranged in the middle of the welding support, and the lower end of the main shaft support is fixed on a sliding mechanism. A main shaft wheel is connected to the upper portion of the main shaft support through a main shaft, the main shaft support supports the main shaft wheel, and a positioning and locking up mechanism is fixed on the main shaft support. The main shaft is connected with the positioning and locking up mechanism, and positioning and locking up of the main shaft in five positions are achieved through the positioning and locking up mechanism. A light supplementing device, a monitoring device, a welding gun vertical movement mechanism and a welding gun swing mechanism are fixed on the upper portion of the main shaft support. A welding gun a